Reputable CenturyLink DSL modems include the Actiontec GT701 and Actiontec Q1000, with four out of five star ratings on Amazon.com, as of June 2015. Both modems are officially listed as CenturyLink compatible devices on InternetHelp.CenturyLink.com, with strong user reviews.
The ActionTec GT701 is a modem that can also be used as a router. The device features DHCP support, NAT support, firewall protection and auto negotiation capabilities.
The ActionTec Q1000 has four ethernet LAN interfaces and runs on VDSL2 technology. The modem offers security features including intrusion protection, denial of service protection, pack inspections, a firewall and WEP or WPA wireless encryption. A list of all other Century Link compatible modems is available at InternetHelp.CenturyLink.com.